In recent decades, the cell phone has provided a convenient form of long-distance communi-cation to the general public. Despite the technological improvements since, cell phones and their smartphone successors have suffered from a lack of clarity over a typical voice call, a result of their limited bandwidth. New phone services, such as HD-Voice and VoLTE, are meant to im-prove the bandwidth that cell phones can use. This claim was tested in part by performing Fourier analysis on cell phone calls that transmitted white noise from one phone to another, where the receiving phone played the surviving signal to an oscilloscope via microphone. The waveform the oscilloscope records was then Fourier transformed to reveal what frequencies were allowed in transmission. This paper reports on the results of one phone of the conversation having HD-Voice and VoLTE, as well as neither phone having these.
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